Illness Anxiety Disorder (IAD) is a mental health condition in which a person becomes overly worried or preoccupied with the belief that they have, or will soon develop, a serious medical illness. This concern exists even when there are no or only mild physical symptoms, and when medical evaluations and tests show that they are healthy. Despite reassurance from doctors, friends, or family, someone with IAD often finds it difficult to let go of the fear that something is seriously wrong with their body. This constant anxiety can lead to significant distress, interfere with everyday life, and reduce overall quality of living.

People with Illness Anxiety Disorder tend to be extremely aware of normal bodily sensations. For example, they might notice a twitch in their arm or a mild stomach ache and immediately think it’s a symptom of a life-threatening disease like cancer, heart disease, or a neurological condition. Even after visiting a doctor and receiving a clean bill of health, the worry often lingers—or shifts to another potential illness. Over time, this creates a repetitive cycle: fear, checking symptoms, seeking reassurance, temporary relief, then new fear. This can make daily life feel like a constant struggle, and it’s emotionally exhausting.
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